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3 years ago

Why does DNA replication only happen once during meiosis?

1 answer:

6 0

DNA replication only happens during meiosis because the chromosome number of the species remains the same from one generation to the next, the chromosome number of germ cells must be reduced by half during meiosis. To achieve this feat, meiosis, unlike mitosis involves a single round of DNA replication followed by two rounds of cell division.

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Si cruzo dos rosas rojas ambas heterocigotas (Rr)

musickatia [10]

Answer:

GRACIAS

Explanation:

MAMA SITA

7 0

3 years ago

Feather color in Christmas Parrots is codominant. You have 2 Christmas Parrots each red and green. What are the percentages for

MatroZZZ [7]

Answer: The percentage of each phenotype to be expressed is *50%* each

Explanation: In codominance, two alleles for a particular trait are equally expressed in an individual carrying it, neither an allele is dominant or recessive over the other. In this case the individual shows the two traits of the allels.

Furthermore, when 2 Christmas parrot are crossed with red and green color in an homozygous codominant trait the heterozygous F1 generation will either be red with traces of green or green showing traces of red.

If parrot 1 (Red) is represented as PR PR and parrot 2 (Green) is PG PG the cross between them will give PR PG therefore, the individual shows both traits.

3 0

4 years ago

Is pollen from a plant biotic or abiotic?

Georgia [21]

Answer:

Pollen from a plant is a biotic factor.

Explanation:

The reason why pollen is a biotic factor is because the pollen has life and it is basically a living cell which can give life to a flower.

3 0

2 years ago

How far away can a proton and an electron be from each other, such that they still exert an electric force on each other of magn

pogonyaev

Answer:

$\sqrt{ \frac{2.3 *10^{-28} }{F} }$

Explanation:

Total force = Force due to gravity + Force due to charges

Total force = $\frac{GMm}{r^{2} } + \frac{kQq}{r^{2} }$

r is the separation between particles.

Charge of a proton(Q) = - (charge of an electron(q) ) = 1.6 * 10^-19 coulombs

Mass of a proton (M)= 1.67×10^-27 kilograms

Mass of an electron (m) =9.11 × 10^-31 kilograms

G=6.67 ×10^−11 N⋅m^2/kg^2

k=8.99 * 10 ^9 N.m^2 / C^2

Plugging in values:

Force due to gravity= (6.67 *10^−11)(1.67 * 10^-27)*(9.11 * 10^-31) /r^2 =1.01 * 10^-67 / r^2

Force due to charges : (8.99 * 10 ^9)*(1.6 * 10^-19)*(1.6 * 10^-19) / r^2 = 2.3 *10^-28 / r^2

We can observe that force due to charges is too large as compared with force due to charge. The ratio of Fc to Fm is 2.3* 10^39. It means that we can ignore force due to gravity.

Total force = Force due to charges.

F = 2.3 *10^-28 / r^2

r = $\sqrt{ \frac{2.3 *10^{-28} }{F} }$

3 0

4 years ago

Which of the gazelle’s naturally selected traits is shown in this picture to be an evolutionary advantage

cluponka [151]

Answer:

Explanation:

Where's the picture

6 0

3 years ago